How to use Session Key-based Request Targeting Mechanism in OCCAS ??

Question

I read Session Key-Based Request Targeting(chapter 5) in Developing SIP Applications.
But, I don't work my application using this mechanism.
I add sesssionKey function with @SipApplicationKey annotation.
I deploy this application. And then, other machine send INVITE request.
My application received INVITE request. But sessionKey function is not called before doInvite function is called.
I used @SipApplicationKey(applicationName="...") annotation.
It didn't work.
sample code is following.
Could someone help me?
import javax.servlet.ServletConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.sip.SipFactory;
import javax.servlet.sip.SipServlet;
import javax.servlet.sip.SipServletMessage;
import javax.servlet.sip.SipServletRequest;
import javax.servlet.sip.SipServletResponse;
import javax.servlet.sip.SipURI;
import javax.servlet.sip.URI;
import javax.servlet.sip.annotation.SipApplicationKey;
public class app2SipServlet extends SipServlet {
private static final long serialVersionUID = 1L;
public static SipFactory sipFactory;
public static ServletContext sc;
public void init(ServletConfig cfg) throws ServletException {
super.init(cfg);
sipFactory = getSipFactory();
sc = getServletContext();
trace("+++ app2SipServlet Initialization");          
@SipApplicationKey
public static String sessionKey(SipServletRequest req) {
String appid = req.getHeader("ApplicationID");
System.out.println("application id : " + appid);
return appid;
@Override
public void doRequest(SipServletRequest req)     throws ServletException, IOException {
trace(req, "doRequest()");
super.doRequest(req);
@Override
protected void doInvite(SipServletRequest req) throws ServletException, IOException {
URI from = req.getFrom().getURI();
String user = ((SipURI)from).getUser();
trace(user + " : " + req.getSession().getApplicationSession().getId());
trace(user + " : " + req.getSession().getApplicationSession().getApplicationName());
SipServletResponse resp = req.createResponse(200);
resp.send();
trace(resp);
}

Answer 1

How many servlets you have defined in your sip.xml .If there are multiple you may want to check if
-- You have defined main-servlet ?
-- or Is deployment descriptor version 1.0 or 1.1